* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
.swiper {
  width: 1226px;
  height: 460px;
  margin: 0 auto;
  position: relative;
}
.swiper > .imgList {
  width: 100%;
  height: 100%;
  position: relative;
}
.swiper > .imgList > .imgItem {
  width: 100%;
  height: 100%;
  position: absolute;
  background-size: 100% 100%;
  left: 0;
  top: 0;
  opacity: 0;
  transition: all 0.5s;
}
.swiper > .imgList > .imgItem.active {
  opacity: 1;
}
.swiper .btn.pre {
  width: 40px;
  height: 30px;
  position: absolute;
  text-align: center;
  line-height: 30px;
  background-color: rgba(0, 0, 0, 0.5);
  color: white;
  font-size: 30px;
  top: calc(50% - 30px);
}
.swiper .btn.next {
  width: 40px;
  height: 30px;
  position: absolute;
  text-align: center;
  line-height: 30px;
  background-color: rgba(0, 0, 0, 0.5);
  color: white;
  font-size: 30px;
  top: calc(50% - 30px);
  right: 0;
}
